JP2546824B2 - V belt automatic transmission V pulley - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a V-pulley of a V-belt automatic transmission in which gear shifting is controlled by a centrifugal roller, and more particularly to a V-belt automatic shifting equipped with a V-belt gear shifting shock absorber. Drive V pulley of the machine.

[Conventional background of the invention and its problems]

A drive V-pulley of a V-belt automatic transmission by centrifugal force control has a fixed-side pulley and a movable-side pulley provided on a drive shaft so as to face each other, and between the fixed face of the fixed-side pulley and the movable face of the movable-side pulley. The V-belt is mounted, and the distance between both faces of the fixed and movable pulleys is increased or decreased by the centrifugal roller set on the back surface of the movable pulley.

The gear ratio of the V-belt automatic transmission is determined by the distance between both faces, and the distance is controlled according to the diameter of the centrifugal roller, the mass, the shape of the inclined surface that produces the axial component of the centrifugal force, and the like. Set so that the characteristics can be obtained. The gear shift characteristic needs to match with the output characteristic of the engine, which is important in determining the performance of a motorcycle or the like using this type of V-belt automatic transmission.

However, in the conventional V-belt automatic transmission of this type, since the centrifugal roller is directly enclosed between the back surface of the movable pulley and the pressure plate, when the engine suddenly changes in rotation, this rotation fluctuation occurs. The centrifugal roller follows and is transmitted to the V belt. For this reason, the impact force accompanied by the rotation fluctuation acts on the V-belt straightly, and the life of the V-belt is shortened. Further, the centrifugal roller collides violently with the pressure plate, so that the centrifugal roller is greatly worn and damaged, and noise is generated. Was the cause of.

[Object of the Invention]

This invention was made in consideration of the above circumstances,
It is intended to provide a V-pulley of a V-belt automatic transmission having a long belt life by effectively preventing the V-belt from being shocked even when the engine rapidly changes.

Another object of the present invention is to provide a V-pulley of a V-belt automatic transmission that effectively prevents the centrifugal roller from being worn or damaged even when the engine suddenly changes in rotation.

[Outline of Invention]

In order to achieve the above-mentioned object, the present invention provides a fixed pulley and a movable pulley on a shaft in a pair, and hangs a V-belt between the fixed face of the fixed pulley and the movable face of the movable pulley. A V-pulley of a V-belt automatic transmission that is mounted and has a centrifugal roller between the back surface of the movable-side pulley and the pressure plate fixed on the shaft, wherein an elastic plate is provided on the pressure plate side and the fixed-side pulley side. Is integrally provided on the shaft by tightening together, and the centrifugal roller is elastically supported between the cushion plate and the movable pulley, and the peripheral portion of the cushion plate is from the pressure plate to the fixed pulley side. And a predetermined gap is formed.

Example of Invention

An embodiment of a V-pulley of a V-belt automatic transmission according to the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a V-pulley of a V-belt automatic transmission according to the present invention, in which reference numeral 10 denotes a drive V-pulley provided on a drive shaft 11 which is an engine crankshaft. The drive V pulley 10 includes a fixed drive shaft 12 rotatably mounted on a drive shaft 11. A clutch housing 13 is fixed to one end of the fixed drive shaft 12, and a centrifugal clutch 15 is constituted by the clutch housing 13 and a centrifugal shoe 14 attached to the end of the drive shaft. The centrifugal clutch 15 is configured to integrally rotate the drive shaft 11 and the fixed side drive shaft 12 at a predetermined rotation speed or more.

A drive V is attached to one side of the fixed side drive shaft 12.
The fixed-side drive V pulley 16 of the pulley 10 is fixed and integrated with the clutch housing 13. Further, on the fixed side drive shaft 12, there is provided a spacer 18 which is rotationally integrated by a spline and whose axial movement is constrained by a tightening nut 17. A movable drive pulley 19 that is slidable is mounted on the shaft. Fixed face 16a of fixed side drive pulley 16 and movable face 19a of movable side drive pulley 19
Drive V pulley 10 is configured to face each other so that the distance can be changed, and V belt 20 is suspended between fixed face 16a and movable face 19a of drive V pulley 10, and driven V pulley ( The rotation is transmitted to (not shown).

On the other hand, on the back surface of the movable side drive pulley 19, there is formed a groove 21 extending in the centrifugal direction and curved to the back side.
A centrifugal roller 22 is housed therein. The bottom surface 23 of the groove 21 is inclined in the direction away from the fixed drive pulley 16 in the centrifugal direction. The centrifugal roller 22 is elastically held by a dish-shaped disk-shaped cushion plate 25 that is inclined so as to approach the fixed drive pulley 16 in the centrifugal direction. The cushion plate 25 has elasticity and is integrally provided with a highly rigid pressure plate 26 located on the back side of the cushion plate 25. These plates 25 and 26 are fixed side drive shaft 1
It is fixed to 2 by tightening together with a tightening nut 17. The central portion of the cushion plate 25 is closely adhered to the pressure plate 26 and integrated, while the peripheral portion thereof is separated from the pressure plate 26 toward the fixed drive pulley 16 side to form a gap δ.
Is formed. Notches 27 are formed on the outer peripheral portion of the cushion plate 25 at predetermined intervals in the circumferential direction, and the presence of the notches increases the elastic deformation force of the peripheral portion. Also, a notch formed on the outer peripheral portion of the pressure plate 26.
As shown in FIG. 2, the reference numeral 28 engages with the connecting wall 29 of the movable drive pulley 19 to transmit the turning force to the movable drive pulley 19.

Next, the operation of the drive V pulley of the V-belt automatic transmission will be described.

When the rotation of the drive shaft 11 increases, the centrifugal clutch 15 receives the centrifugal force to transfer the power to the clutch housing.
Communicate to 13. As a result, the rotation is transmitted to the fixed drive pulley 16 and the fixed drive shaft 12 that are integral with the clutch housing 13, and the cushion plate 25 and the pressure plate 26 connected to the drive shaft 12 are also transmitted at the same time. Due to the rotation of the pressure plate 26, the notch 28 on the plate 26 drives the connecting wall 29 of the movable drive pulley 19 to drive the drive pulley 19 at the same time, and the rotational force is transmitted to the V belt 20.

By the way, when the drive shaft 11 is rapidly accelerated, the centrifugal clutch 15 is momentarily connected, so that the movable drive pulley 19 also rapidly starts to rotate. At this time, the centrifugal roller 22 climbs the bottom surface 23 of the groove 21 by a sudden centrifugal force,
Although it tries to collide with the pressure plate 26, the cushion plate 25 is interposed inside the pressure plate 26. Therefore, before the collision with the pressure plate 26, the cushion plate 25 is brought into contact with the cushion plate 25.
At 25, the impact force is absorbed.

The centrifugal roller 22 is generally covered with a resin film for noise prevention, and this resin film prevents the centrifugal roller 22 from being worn or damaged by a sudden centrifugal force. And
By providing the cushion plate 25, it is possible to prevent a sudden rotation fluctuation force from being transmitted to the V-belt 20 to cause local buckling or crushing and thus to shorten the belt life.

In the embodiment, the invention is applied to the drive V pulley of the V-belt automatic transmission. However, the drive V pulley may be replaced with a driven V pulley.

〔The invention's effect〕

As described above, according to the present invention, the pressure plate and the cushion plate made of the elastic plate on the fixed pulley side are integrally provided on the shaft by tightening together.
A centrifugal roller is elastically supported between the cushion plate and the movable pulley, and the peripheral portion of the cushion plate is separated from the pressure plate toward the fixed pulley to form a predetermined gap. The number of parts can be reduced by co-fastening, and the assemblability can be improved and simplified. On the other hand, the centrifugal roller functions as a cushion plate when the engine rapidly changes, such as when the V pulley starts rotating due to engine start. Since it abuts on the contacting pressure plate, the impact force acting on the centrifugal roller is absorbed by the elastic deformation force of the cushion plate, is buffered and guided by the pressure plate, and the rapid rotational fluctuation force is directly transmitted to the V-belt. The V-belt does not have local buckling or crushing Life can be prevented effectively from impaired.

On the other hand, even if the centrifugal roller receives a sudden rotational fluctuation force, it first comes into contact with the cushion plate, is absorbed by the impact force due to plate deformation, and is guided by the pressure plate, so there is no direct collision with the pressure plate. ,
It is possible to reduce wear and damage of the centrifugal roller and to reduce noise.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a V-pulley of a V-belt automatic transmission according to the present invention, and FIG. 2 is a view taken along line II-II in FIG. 10 …… Drive V pulley, 11 …… Drive shaft, 12
...... Fixed side drive shaft, 13 ...... Clutch housing, 15 ...... Centrifugal clutch, 16 ...... Fixed side drive pulley, 16 a ...... Fixed face, 19 ...... Movable side drive pulley, 19 a ...... Movable face, 20 ...... V-belt, 22-centrifugal roller, 25-cushion plate, 26-pressure plate, 27-notch part.

Claims (3)

(57) [Claims] 1. A fixed-side pulley and a movable-side pulley are provided on a shaft so as to face each other, and a V-belt is hung between the fixed face of the fixed-side pulley and the movable face of the movable-side pulley, and the back surface of the movable-side pulley. In a V-belt of a V-belt automatic transmission in which a centrifugal roller is enclosed between the pressure plate fixed on the shaft and the pressure plate, the pressure plate and a cushion plate made of an elastic plate on the fixed pulley side thereof are fastened together. Is provided integrally with the shaft, and the centrifugal roller is elastically supported between the cushion plate and the movable pulley, and the peripheral portion of the cushion plate is separated from the pressure plate toward the fixed pulley, and a predetermined gap is provided. A V-pulley for a V-belt automatic transmission characterized by being formed. 2. The cushion plate is formed by a plate-shaped disc-shaped elastic plate, and the central portion of the cushion plate is brought into close contact with and integrated with the pressure plate.
The V-pulley of the V-belt automatic transmission according to the item. 3. The V-pulley of the V-belt automatic transmission according to claim 1, wherein the pressure plate has notches formed on the outer peripheral portion thereof at intervals in the circumferential direction.